I gonna go out on a limb and speculate a bit... There are a bunch of items in Odin's Vault including The Eye and Orb of Agamoto, the Flame of Surtur, and the Infinity Gauntlet, among other things. I believe I also read that one of the royal family dies, probably Frigga, in an attack. I think the chances are failry high that the vault is looted releasing all of these items back into the world creating new stories and characters like Ragnarok for Thor/Surtur and Dr. Strange with his items. I have no really great idea for how those items find their way out of the Vault without it being looted.